Is it true that a drop of water can pass through a solid travelling by 1800m/s2?

You have given an acceleration rate, 1800 m/s^2, not a speed.

What happens will depend upon the relative speed of the droplet and thickness and material strength of the solid.

You seldom see water droplets traveling that fast. They would be torn up and decelerate in the atmosphere. In a vacuum, they would partially evaporate and then freeze to ice.

There nothing magical about a speed of 1800 m/s.